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n in (-oo:+oo)
7-4*n = (4/7)*n-(335/7) // - (4/7)*n-(335/7)
335/7-4*n-((4/7)*n)+7 = 0
(-4/7)*n-4*n+335/7+7 = 0
384/7-32/7*n = 0 // - 384/7
-32/7*n = -384/7 // : -32/7
n = -384/7/(-32/7)
n = 12
n = 12
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